Malicious PDF — malware analysis report

Static analysis result for SHA-256 890510c5fda81ab7…

MALICIOUS

PDF

77.8 KB Created: 2021-09-24 07:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed78bf7f7b2f72f63393205741c74519 SHA-1: 09e6e0a563e8970f46190b9ee68f60480b04d704 SHA-256: 890510c5fda81ab7218d574e0308eb6d435f401106b07abf85456fed19fcf010
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=snaptube+apk+for+tablet PDF link annotation
    • http://bebelino.ru/userfiles/file/49636746651.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/98135890687.pdfIn PDF document text
    • https://empresa-venta.hr/files/26215688260.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/24956213065.pdfIn PDF document text
    • http://willbramephotography.com/17180947463.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/45971805654.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3590a83d2---40952221572.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/60739880223.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/tibapuralituvigavinuzu.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/kakateninoziz.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a10a5a460a7020f6763d8da0c6604d45/40845889870.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/53914699684.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1632223608.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/lowofozamovet.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/bavokezabewuwikefoja.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210919145831712162.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/44615636734.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161331a83ded0d---newamopupe.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/24153028888.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/46985721155.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/90561303761.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/bekemitabebogaje.pdfIn PDF document text
    • https://bczenekar.hu/files/file/20526240203.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/99551740123.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/zusilupojaf.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/nofagelowopuneroboka.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC47 10496 bytes
SHA-256: b20d3c967bc1ab2ca5396c6f574c2203a1aa44d5cb22f03af04b12f29111a960
font_01_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 17644 bytes
SHA-256: 43079531a675191ae1e1cd62373eebad5dff653f6a579a6dbc0b9cadb072d841

Open this report in the interactive analyzer, or submit your own file for analysis.